<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>函数的认识</title>
</head>
<body>
<script>
  //函数的定义
  function fun() {
    console.log('hello word');
  }
  //函数的调用
  fun();
  function fun02(a,b) {
    console.log(a);
    console.log(b);
  }
  fun02(10,20);
</script>
</body>
</html>